AA 4355 then AA 5150 at Detroit
New York LaGuardia → Detroit → Washington National
Timetable, Detroit time
09:01AA 4355 from New York LaGuardia at the gate
12:27AA 5150 to Washington National leaves the gate
3 h 26 apart on the timetable
The last days
AA 4355 and AA 5150 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.